Size dependent intraguild predation and cannibalism in coexisting wolf spiders (Araneae, Lycosidae)

Ann L. Rypstra, F. Samu

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Two species of wolf spider, Hogna helluo (Walckenaer 1837) and Pardosa milvina Hentz 1844 dominate the predatory community on the soil surface of agroecosystems in eastern North America. Although as adults they are very different in size, differences in phenology ensure that they overlap in size at various times during the year. In a laboratory experiment, we explored the propensity of each species to attack and kill the other wolf spider species (intraguild predation), conspecifics (cannibalism) or crickets (ordinary predation). Both spiders attacked and killed a broader size range of crickets more quickly than they approached other spiders. We found no differences in Hogna foraging on conspecifics or Pardosa, but Pardosa attacked and killed Hogna more readily than conspecifics. Because Hogna was so slow in attacking other spiders, their impact as an intraguild predator may be quite small, especially if their approach to crickets is an indication of their predatory tendencies with insects. On the other hand, Pardosa attacked and killed small Hogna as readily as crickets, which suggests they may have an influence on Hogna populations if Hogna young emerge coincident with large juvenile or adult Pardosa.

Original languageEnglish
Pages (from-to)390-397
Number of pages8
JournalJournal of Arachnology
Volume33
Issue number2
DOIs
Publication statusPublished - 2005

Fingerprint

Pardosa
Lycosidae
cannibalism
Gryllidae
Araneae
predation
Pardosa milvina
agroecosystems
phenology
foraging
predators
insects
soil

Keywords

  • Agrobiont spiders
  • Cannibalism
  • Intraguild predation
  • Predator-prey

ASJC Scopus subject areas

  • Insect Science

Cite this

Size dependent intraguild predation and cannibalism in coexisting wolf spiders (Araneae, Lycosidae). / Rypstra, Ann L.; Samu, F.

In: Journal of Arachnology, Vol. 33, No. 2, 2005, p. 390-397.

Research output: Contribution to journalArticle

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